Question

question 1 of 12
how did dr. daniel hale williams improve the field of medicine?
he founded the government healthcare system.
he was the first person to perform heart surgery.
he helped create medical guidelines.
he was the first person to make a microscope.

Explanation:

Dr. Daniel Hale Williams was a pioneering surgeon known for performing one of the first successful open-heart surgeries in 1893, which advanced cardiac medicine. The other options are incorrect: he did not found a government healthcare system, create major medical guidelines, nor was he the inventor of the microscope (that credit goes to earlier scientists like Zacharias Janssen).

Answer:

He was the first person to perform heart surgery.